28652569 has 4 divisors (see below), whose sum is σ = 31257360. Its totient is φ = 26047780.

The previous prime is 28652557. The next prime is 28652579. The reversal of 28652569 is 96525682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28652569 - 2⁵ = 28652537 is a prime.

It is a super-2 number, since 2×28652569² = 1641939420599522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28652579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1302379 + ... + 1302400.

It is an arithmetic number, because the mean of its divisors is an integer number (7814340).

Almost surely, 2^28652569 is an apocalyptic number.

It is an amenable number.

28652569 is a deficient number, since it is larger than the sum of its proper divisors (2604791).

28652569 is a wasteful number, since it uses less digits than its factorization.

28652569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2604790.

The product of its digits is 259200, while the sum is 43.

The square root of 28652569 is about 5352.8094492519. The cubic root of 28652569 is about 305.9998326853. Note that the first 3 decimals are identical.

The spelling of 28652569 in words is "twenty-eight million, six hundred fifty-two thousand, five hundred sixty-nine".